A compound that contains only carbon, hydrogen and oxygen has the following
2 answers:
Answer: A) C5H8O2
Explanation: Let's assume we have 100 grams of the unknown compound. We can then find grams for each element by multiply it's percentage times 100g. (e.g., carbon at 60% gives 60 grams of C). Then divide the mass of each element by it's molar mass. That will normalize the number of that element in relation to the others. E,g,, the 60 grams of carbon, divided by its molar mass of 12.01 g/mole gives 5 moles of C atoms. For H we get 8, and for O we get 2. That gives us the empirical formula C5H8O2
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Answer:
The ratio [A-]/[HA] increase when the pH increase and the ratio decrease when the pH decrease.
Explanation:
Every weak acid or base is at equilibrium with its conjugate base or acid respectively when it is dissolved in water.
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This equilibrium depends on the molecule and it acidic constant (Ka). The Henderson-Hasselbalch equation,
shows the dependency between the pH of the solution, the pKa and the concentration of the species. If the pH decreases the concentration of protons will increase and the ratio between A- and AH will decrease. Instead, if the pH increases the concentration of protons will decreases and the ratio between A- and AH will increase.